Issue
Korean Journal of Chemical Engineering,
Vol.33, No.9, 2732-2737, 2016
Formation of uniform TiO2 nanoshell on α-alumina nanoplates for effective metallic luster pigments
To synthesize non-corroding effect pigment appearing metallic silver in color, we coated uniform anatase TiO2 nanoshell via sol-gel chemistry. Under the reaction condition using 3M TiCl4 aqueous solution : deionized water : HCl solution=0.75mL : 20 mL : 0 mL, ~50 nm-thick smooth TiO2 nano-shell was fully coated on the surface of α-alumina nanoplates; consequently, the synthesized effect pigments exhibited similar lustering effect and structuring color to commercial effect pigment. Under relatively acidic condition and higher TiCl4 precursor concentration condition (3 M TiCl4 aqueous solution : deionized water :HCl solution=0.75mL : 20 mL : 0.05mL for acidic condition and 1.0 or 1.5mL : 20 mL : 0 mL for higher TiCl4 precursor concentration condition), rougher TiO2 shell was formed.
[References]
  1. Debeljak M, Hladnik A, Cerne L, Gregor-Svetec D, Color Res. Appl., 38, 168, 2012
  2. Pfaff G, Inorg. Mater., 39, 123, 2003
  3. Stengl V, Subrt J, Bakardjieva S, Kalendova A, Kalenda P, Dyes Pigment., 58, 239, 2003
  4. Teaney S, Pfaff G, Nitta K, Eur. Coat. J., 4, 90, 1999
  5. Sharrock S, Schuel N, Eur. Coat. J., 1/2, 20, 2000
  6. Suh MW, Lee SJ, You MS, Park SB, Im SH, RSC Adv., 5, 56954, 2015
  7. Cheng H, Ma J, Zhao Z, Qi L, Chem. Mater., 7, 663, 1995
  8. Yang J, Lin Y, Meng Y, Korean J. Chem. Eng., 30(11), 2026, 2013
  9. Chu VB, Park SJ, Park GS, Jeon HS, Hwang YJ, Min BK, Korean J. Chem. Eng., 33(3), 880, 2016